A parallel algorithm suitable for simulating multi-sized particle systems and multi-phase fluid systems is proposed based on macro-scale pseudo-particle modeling(MaPPM).The algorithm employs space-decomposition of the...A parallel algorithm suitable for simulating multi-sized particle systems and multi-phase fluid systems is proposed based on macro-scale pseudo-particle modeling(MaPPM).The algorithm employs space-decomposition of the computational load among the processing ele-ments(PEs)and multi-level cell-subdivision technique for particle indexing.In this algorithm,a 2D gas-solid system is simulated with the temporal variations of drags on solids,inter-phase slip velocities and solids concentration elaborately monitored.Analysis of the results shows that the algorithm is of good parallel efficiency and scalability,demonstrating the unique advantage of MaPPM in simulating complex flows.展开更多
Monitoring of frozen soil hydrology in macro-scale was performed by Chinese and Japanese scientists from 1997 to 1998. Quality measured data were obtained. Measured data on soil moisture and temperature are preliminar...Monitoring of frozen soil hydrology in macro-scale was performed by Chinese and Japanese scientists from 1997 to 1998. Quality measured data were obtained. Measured data on soil moisture and temperature are preliminarily analyzed. Based on profiles of soil temperature and moisture in individual measured sites, intra-annual freezing and melting process of soil is discussed. Maximum frozen and thawed depths and frozen days in various depths are estimated. The work emphasized the spatial distribution on soil temperature and moisture in macro-scale and the effect of topography on conditions of soil water and heat.展开更多
The brittleness of ceramics restricts their engineering application.Prestressing is promising to solve the problem,yet still lacks enough attention and ex-tensive investigation.This work proposes the idea of macro-sca...The brittleness of ceramics restricts their engineering application.Prestressing is promising to solve the problem,yet still lacks enough attention and ex-tensive investigation.This work proposes the idea of macro-scale and micro-scale prestressed ceramics:to form compressive prestress in macro-or micro-scale range in the ceramics by designed additional force,which offsets the fracture stress at the crack tips,then enhances the strength of ceramics.The macro-scale prestressed ceramic has a designed long-range ordering stress distribution in a large scale,similar to the reinforced concrete and tempered glass.The micro-scale ceramic has a designed short-range ordered stress dis-tribution,similar to that in the natural biomaterials.Strategies constructing the macro-scale and micro-scale prestressed ceramics are planned.Future research interests and challenges are prospected for developing the mechan-ical properties of ceramics.展开更多
1.Introduction To design novel architectures with unique properties that surpass those of natural matter,scientists have developed diverse structures/materials by incorporating artificial structures of periodic/aperio...1.Introduction To design novel architectures with unique properties that surpass those of natural matter,scientists have developed diverse structures/materials by incorporating artificial structures of periodic/aperiodic nano-,micro-,and macro-scale,so called metamaterials.展开更多
基金This work was supported by the National Key Program for Developing Basic Sciences(Grant No.G1999032801)the National Natural Science Foundation of China(Grant Nos.20336040and 20221603)the Chinese Academy of Sciences(Grant No.INF105-SCE-2-07).
文摘A parallel algorithm suitable for simulating multi-sized particle systems and multi-phase fluid systems is proposed based on macro-scale pseudo-particle modeling(MaPPM).The algorithm employs space-decomposition of the computational load among the processing ele-ments(PEs)and multi-level cell-subdivision technique for particle indexing.In this algorithm,a 2D gas-solid system is simulated with the temporal variations of drags on solids,inter-phase slip velocities and solids concentration elaborately monitored.Analysis of the results shows that the algorithm is of good parallel efficiency and scalability,demonstrating the unique advantage of MaPPM in simulating complex flows.
文摘Monitoring of frozen soil hydrology in macro-scale was performed by Chinese and Japanese scientists from 1997 to 1998. Quality measured data were obtained. Measured data on soil moisture and temperature are preliminarily analyzed. Based on profiles of soil temperature and moisture in individual measured sites, intra-annual freezing and melting process of soil is discussed. Maximum frozen and thawed depths and frozen days in various depths are estimated. The work emphasized the spatial distribution on soil temperature and moisture in macro-scale and the effect of topography on conditions of soil water and heat.
基金Fundamental Research Funds for the Central Universities,Grant/Award Number:WUT:3120620196China Postdoctoral Science Foundation,Grant/Award Number:2021M702540National Key Research and Development Program of China,Grant/Award Number:2021YFA0715700。
文摘The brittleness of ceramics restricts their engineering application.Prestressing is promising to solve the problem,yet still lacks enough attention and ex-tensive investigation.This work proposes the idea of macro-scale and micro-scale prestressed ceramics:to form compressive prestress in macro-or micro-scale range in the ceramics by designed additional force,which offsets the fracture stress at the crack tips,then enhances the strength of ceramics.The macro-scale prestressed ceramic has a designed long-range ordering stress distribution in a large scale,similar to the reinforced concrete and tempered glass.The micro-scale ceramic has a designed short-range ordered stress dis-tribution,similar to that in the natural biomaterials.Strategies constructing the macro-scale and micro-scale prestressed ceramics are planned.Future research interests and challenges are prospected for developing the mechan-ical properties of ceramics.
基金financially supported by the National Key Research and Development Program of China(2023YFB4604800)the National Natural Science Foundation of China(52275331)financial support from the Hong Kong Scholars Program(XJ2022014)。
文摘1.Introduction To design novel architectures with unique properties that surpass those of natural matter,scientists have developed diverse structures/materials by incorporating artificial structures of periodic/aperiodic nano-,micro-,and macro-scale,so called metamaterials.
